Improvement in flue-walls for salt-blocks



PORTER mow.

Evaporating Pan.

Patented April 28. 18 63.

No. 38,332. v

N. PETERS. Phalu-lilhc mvhen wnhingwn. D12.

UNITED STATES PATENT OFFICE.

TIMOTHY R. PORTER, OF SYRACUSE, NEV YORK, AND GEORGE H. COOK,

. OF NEW BRUNSWICK, NEW JERSEY.

IMPROVE MENT IN FLUE-WALLS FOR SALT-BLOCKS.

Specification forming part of Letters Patent No. 38,332, dated April 28, 1863.

scription thereof, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

The object of our invention will be understood by a reference to the accompanying drawing of a salt-block or manufactory in which common salt is made by artificial heat,where a a a represent the iron kettles in which the brine is boiled away and the salt made; I) b b I) I), the walls upon and between which the kettles are set c, the fire-door; d dd, the the fuel; 6 c e, the line or passage under the kettles and between the flue-walls for the flame and heated products of combustion to pass from the fuel to the chimney f f f. g g is a conductor or pipe with a faucet at each ket tie for conveying brine from a reservoir to the kettles.

In an apparatus of this kind salt is extensively made. From the intense fires which are kept up the whole structure becomes very hot, so much so that the sidewalks, which are of earth, four feet wide, and run along parallel with the flue-walls and about a foot below their top, become so hot as to greatly inconvenience and in some cases to absolutely greatly incapacitate the workmen, and the salt in the bins which are outside of the side walks is considerably heated andcaked By our invention the heating through the walls and the sidewalks is almost entirely prevented, the injury to the workmen obviated, and the loss of heat by radiation and conduction greatly diminished.

Our invention consists, essentially, in building the fluewalls hollow. By this mode of construction the walls are made good non conductors of heat, and the moderate rise of temperature to which they are still liable can and drawing.

be ecomomically diminished by causing the air which supports the combustion of the fuel and its gaseous products to circulate through and along the hollow walls before passing to the grates and fines. The walls will act as simple non-conductors, even if their ends are built up solid; but if sliding doors are used to close up the ends of the hollow walls, these doors can be so adjusted as to admit the air at the front or rear ends of the walls or at both ends, and it may be passed'from there by proper openings through the flue-walls to the fuel and flues. We find a convenient way of arranging them is to close the front sliding doors and to open those in the rear, when the air will enter at the rear end of the hollow Wall and pass along toward the front andthrough to the fuel, and so on. We do not, however, desire to limit ourselves in regard to the modes of admitting the air.

WVe believe the above description to be quite sufficient to enable those familiar with the common saltblocks to construct and apply our invention, and we have indicated in our drawing, by dotted red lines,the hollow spaces which We have found to work well in our trial block.

h h h are the hollow spaces in the walls;i i, their rear ends; it k, their front ends, and Z l the passages from the hollow walls to the fire.

The invention is applicable to blocks in which either wood or coal is burned.

WVhatwe claim as our invention, and desire to secure by Letters Patent, is-

The application of hollow walls to the construction of fluewalls in salt-blocks, substain tially as set forth in the foregoing description '1. R. PORTER. GEO. H. COOK. \Vitnesses present as to the name of Geo. ll. Cook:

hIARlIN NnvINs, CHARLES C. \VELLs. NVitnesses present as to the name of T. R. Porter:

OSCAR H. HASTINGS, CHAS. ANDREWS. 

